One vertex per element, one color per generator, with an edge from x to x·s.
(9,10,14,12)(11,16,18,15)(13,20,21,17)(19,22,24,23)(25,26)(27,30)(28,33)(29,32)(31,36)(34,37)(35,39)(38,40)(1,2)(3,8)(4,5)(6,7)(11,18)(13,21)(15,16)(17,20)(26,27)(29,37)(31,33)(35,40) involution — undirected(2,7)(3,4)(9,11,14,18)(10,15,12,16)(13,19,21,24)(17,22,20,23)(25,27,30,26)(28,33,36,31)(29,34,37,32)(35,39,40,38)(1,3,6,4)(2,8,7,5)(9,12,14,10)(11,15,18,16)(13,20,21,17)(19,22,24,23)(25,28)(26,31)(27,33)(29,35)(30,36)(32,38)(34,39)(37,40)(1,4,6,3)(2,5,7,8)(9,11)(10,16)(12,15)(13,19)(14,18)(17,23)(20,22)(21,24)(25,29)(26,32)(27,34)(28,35)(30,37)(31,38)(33,39)(36,40)(1,5)(2,3)(4,7)(6,8)(9,13)(10,17)(11,19)(12,20)(14,21)(15,22)(16,23)(18,24)(25,28)(26,31)(27,33)(29,35)(30,36)(32,38)(34,39)(37,40) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.